seymour



I To all whom it mayioonce'rm U ITED STATES'-P ATENr OFFICE.

' HEN Y A; SEYMOUR, or" WASIIIN n pls'rnmr or COLUMBIA.

- ELECTRIC-ARC LAMP. srnerrrcntrron forming part of Lettersratent no. 574,119, dated Deeember'29, 1896.

' Applioatlon filed'Ju1y18p1896. swarm; 599,692. on main.)

outwardly-projecting pins bQwhich 'Be it known that-I', HENRY AVSEYMOUR, of engage inbayonet-lock slots 0, formed in the 'ashington, District of Columbia, have inring (1, whichconneet the two side rods. This 5 in Arc-Lamps; and I'do hereby declare the ailatitathment of the globe-holder. I

scription of thelnvention, such as will enable to thezcarbonsholder G by means of a split ot ers skilled in the art to which it appertains' socket e and a screw-threaded thumb-nut f. to. make anduse the same. II is an arc-inclosing globe. It is secured o L My invention relates to an improvement in at itsvlower end practically air-tight to the arc-lamps, and especially to'that type oflarn'ps globe-holder F. Upon the upper end of the in which arc-inclosing globes are employed. 'globedss'eated a cover I, which is provided a i i .As' ordinarily constructed, arcinclosing with an opening g, through which the carbon- V l globes have'been provided with a cover havholderG passes and is fed. An annular valve ing a hole formed therein, through which the h snugly encircles the'carbomholder and seats feeding carbon passes and in which it snugly s. ln order'to maintain such arc-inclosing globes as nearly air-tight as it was possible, various constructions of packing were, re sorted to for packing the opening between the outer surfabe of the'feedingcarbon and the following to be a full, clear, and exact (ie E is the feeding carbon, which is attached h its operation in adjusting and feedmadeto snugly fit the carbon-holder;

The arc-inclosing globe is preferably formed with its upper portion '11 of small diameter to and uneven surface, and, further, because in the man facture of carbons it is impossible h to make them perfectly straight and true that It W-IHIGCGIVG the full length of 8c e object of my'invent'ion is to provide an ,bot carbons and thus render it unnecessary arc-inclosingglobeof such construction and so combinedwith the lamp that it may be maintained practically air-tight without the f v necessity of applying packing of any kind or than the'diameter of the feeding carbon. The description around the carbon. I cover of" the arc-inclosing globe is mounted With thisendin'viewmy invention consists upon and supported by thecarbon-holdcr, so

t cover which is mounted'uponand supported of theu'pperlend' of the globe after new cary the carbon-holder. .bons have been inserted.

he accompanying drawing illustrates my e The outer globe is secured in a practically mproved lamp partly in side elevationand, air-tight manner to the lamp, and hence preartly in vertical section.

c vents the ingress of outer air thereto, and is the Iamp-casing, B the lamp-floor, 0 serves to zs'hield the are-mclosing. globe. 1e outer globe, and D-the'side rods, of the I Lmp frame: The lower carbon E is'secured 1 a. socket a by means of a set-screw or other cvice. Socket a is preferably formed interal with the globe-holderF, which is pro- Having fully described myinvehtion,what In testimony whereof I have signed this 1 claim as new, and desire/c0 secure byLettegs ,specification in the'presence of two subscrib- 1 o Patent, i s ing witnesses-L In an arc-lamp, the combination with its HENRY SEYMOUR 5 carbons, andcarbon-holder', of an arc inclosingglobdprqvided with a, cover which is Witnesses: mounted upon and supported by the carbon S. G.NOTTINGHAM, holder, substantially as set fbrth.';- -S. W. FOSTER. 

